BBOTANICAT “GAZETTE 
MARCH, 1895. 
Apparatus for physiological botany. 
W. C. STEVENS. 
WITH PLATES IX-xII, 
I propose to describe in detail some apparatus for physio- 
logical botany which I have found very useful in my labora- 
tory. The description may at least serve as a useful sugges- 
tion here and there for those wishing to equip a physiological 
laboratory, but with scanty funds for the purpose. 
The apparatus here described is made almost entirely of 
white pine and with ordinary wood working tools, including 
a lathe and scroll saw. 
The table to which the apparatus is attached when in use 
consists of a single board one and one-half inches thick, sev- 
enteen inches wide and sixteen feet long, fastened by means 
of iron brackets on a level with the bases of two south win- 
dows, and twenty-eight inches from the floor. The table is 
set out on the brackets two and one-half inches from the wall. 
See plate X, figure I. 
CENTRIFUGAL MACHINE. Plate IX, fig. 5.—This consists 
of a wheel a, seventeen inches in diameter, which serves as a 
base for the pan containing the seedlings, and as a pulley for 
slow motion in other experiments; a small pulley 4, two and 
one-half inches in diameter, to carry the belt from the motor 
when rapid motion is desired; an upright shaft c, one and one- 
half inches in diameter and fourteen and three-fourths inches 
mounting the pulleys and shaft as shown in the figures. Steel 
cores three-eighths inch in diameter are sunk into the two ends 
of the shaft. The upper core has its exposed end counter- 
sunk to admit the point of a large screw that has been tapered 
with a file while held in the lathe chuck. The core in the 
lower end of the shaft has been tapered in the same manner 
7—Vol. XX—No. 3. 
